Car-brake



(No Model.)

J. T. DUFF. GAR BRAKE.

No. 523,763. Patented'JuIy 31, 1894.

miimssas'. Qinmnflw UNITED STATES Y PAT NT OFFICE.

JOHN T. DUFF, OF PITTSBURG, PENNSYLVANIA.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 523,763, dated July 31,1894. pp n filed February 20, 1894. Serial No. 500.873- (No model.)

To all whom it may concern.-

Be it known that I, JOHN T. DUFF, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inCar-Brakes; and I do hereby declare the following to be a full, clear,

and exact description of the invention, such as will enable othersskilled in the art towhich it pertains to make and use the same,reference being had to the accompanying drawings,-which form a part ofthis specification.

My invention relates to an improved car brake, and it consists in a diskattached to one of the axles of the car, a horizontally moving brakeshoe, and means for moving said shoe, together with certain details ofconstruction and combination of parts as wilLbe fully describedhereinafter.

In the accompanying drawings, Figure 1. is

- a side elevation of a portion of a street rail- Way car, provided withmy improved brake which is constructed in accordance with my invention.Fig. 2. is a front sectional elevation of the same, said section takenon the line w. 0:. of Fig. 1. Fig. 3. is an enlarged side elevation ofthe two shafts used in operating the brake shoe. Fig. 4. is an enlargedside sectional elevation of the brake shoe holder, showing the shoe inposition. Fig. 5. is asectional plan view of the same,'said sectiontaken on the line y. y.

To construct a railway brake in accordance with my invention, and adaptthe same to an ordinary street railway car 1. I attach in a suitablemanner to the front axle 2. a hardened metal disk 3. This disk 3. isarranged at or near the center of the axle, and may be formed in twosections bolted together when arranging the brake on cars that have beenin use for some time; or the same may be cast with or shrunk on theaxle. Arranged at the front of this disk 3. and in line with the same isa frame 4. securely bolted beneath the fioor of the car 1. and havingtwo integral bearings 5. 6. These bearings are bored smooth, and the one5 at the rear of a greater diameter than the other. Operating in therear bearing 5 is a strong shaft 7. having a central threaded openingextending in the direction of its length in which a threaded shaft 14.is made to operate. This last mentioned shaftl4. is formed with athreaded part 21. and a collar 15. said collar bearing against the rearof the bearing 6. and is fitted at'its forward endwith a bevel pinion16. The rear end of the large shaft 7. is provided with a shoe holder 9,consisting of a casting end of the earl is a shaft 18. fitted with ahand wheel 19. at the top, and provided with a bevel gear 17. at thebottom, said gear being in mesh with that 16 attached to the forward endof the small horizontal shaft 14.

In operation: when it is desired to set the brake, and thereby retard orstop the car 1. the operating hand-wheel 19. is revolved, which turnsthe bevel gearing 16. 17. and thereby rotates the shaft 14. This shaftbeing confined in its bearing 6. is prevented from end movement and byits rotary movement withdraws the threaded portion 21 partly from thelarge shaft 7. This withdrawal w ll move the large shaft 7 toward thedisk 3. and move the brake shoe against the same thereby creatingsufficient friction to stop or check the car as desired. By thisconstruction and arrangement a slight movement of the hand wheel willset or release the brake, and by the combined force or leverage of thescrew thread 14. the gearing 1,6. 17. and hand wheel 19. the wheels ofthe car may be locked or released instantly.

, Having thus described my invention, I claim- In a car brake thecombination consisting of the disk 3. attached to the axle of the car,the frame 4 beneath the floor of the car and in line with the said disk,suitable bearings 5. 6. formed integral with said frame, shafts 7. 14arranged in said bearings the one connected to the other by means ofscrew threads,

a brake shoe holder 9. attached to the larger In testimony that I claimthe foregoing I shaft, and a bevel gear 16 attached to the hereuntoaffix my signature this 18th day of smaller shaft 14. the gear 17. inmesh with December, A. D. 1893. the gear 16. and attached to avertically ar- JOHN T. DUFF. [L. 8.]

5 ranged shaft 18. fitted with an operating wheel In presence of- 19.all arranged and combined for service, JOHN G. THOMPSON,

substantially as and forthe purpose described. J. A. HERRON.

